Improvement in knob-spindle fasteners



i2. F. LINCOLN.

Knob-Spindle Fasteners. No.156,9 32. ffgten ted Nov. 17,1874.

J N fiVETTt/ohw ATTORNEYS,

UNT ED STATES PATENT OFFICE.

EUGENE F. LINCOLN, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO HIMSELF ANDJOHN G. HANCOCK, OF SAME PLACE.

IMPROVEMENT IN KNOB-SPlND-LE FASTENERS.

Specification forming part of Letters Patent No. 156,932, datedNovtniber 17,1874; application filed October 3i, 1874.

To all whom it may concern Be it known that I, EUGENE F.L1NcoLN, ofBoston, in the county of Suffolk and State of Massachusetts, haveinvented a new and Improved Knob-Spindle Look, of which the following isa specification:

My invention consists of a little slide-bolt inside of the rose orescutcheon-plate, to lock the knob-spindle by sliding into a notch inthe edge ofa disk on the spindleyalso, inside of the escutcheon -plate,the said slide having a pawl with a handle for Working it pivoted to it,so as to drop into the slot of the escutcheonplate, through which itprojects, to lock the bolt when shoved forward, and it has a spring forthrowing it back when the pawl is pulled out of the slot to release theslide-bolt. The object is to provide a simple and efficient inside lockfor fastening the door of water and other closets and sleeping-rooms,850., temporarily, without having to change the key from one side of thedoor to the other.

Figure l is a horizontal section of a knobt latch, showing theapplication of my invention and Fig. 2 is an inside elevation of theesoutcheonplate and section of the spindle.

Similar letters of reference indicate correspondin g parts.

A is the knob-spindle; B, the escutcheonplate; G,the disk on thespindle, with a notch, D, for the slide-bolt; E, the bolt, and F thepawl for working it. The disk is arranged in a central recess in theinside of the escutcheOn.

plate, and the boltis arranged in a recessin the same side, radial tothe disk, and in a lateral extension, G, of the escutcheon-plate. Thepawl has a knob, H, attached for manipulat ing it, and it is pivoted tothe bolt and arranged to swing into and out of the slot in theescutcheon-plate, in which it moves, so as to fasten the bolt in thenotch in the disk by dropping into the slot and fastening therein by itsbeveled end, which is pressed under the undercut wall of the end of theslot at I by the spring J, which also throws the bolt back when the pawlis disengaged to unlock theknob-spindle.

This contrivance makes a very eficient and desirable lock with butlittle expense. The bolt might be arranged to slide directly into anotch in the spindle; but it is preferable to use the disk, because itmakes a stronger fast ening.

Having thus described my invention, I claim as new and desire to secureby Letters Pat- The slide-bolt E, locking-pawl F, and spring J, incombination with thenotched disk 0 and the knob-spindle, substantiallyas specified.

- EUGENE F. LINCOLN Witnesses:

JAMES MORGAN,

MICHAEL 0. SMITH.

